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Doctors Medicines MCQs Q&A

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Consider the following statements and choose the correct answer:
1. A direct proportionality exists between vapour pressure and the concentration of water vapour in the atmosphere
2. Relative humidity is an expression of the ratio of the actual vapour pressure of the atmosphere when saturated at the same temperature
3. A rise or fall in temperature with no change in vapour pressure will cause a drop or rise, respectively, in relative humidity
4. A rise or fall in vapour pressure with no change in temperature will be accompanied by a rise or fall, respectively, in relative humidity
Consider the following statements and choose the correct answer:
1. Intense or strong light retards the growth of shoot
2. Shade plants are shorter and stockier than sun plants
3. Shade plants have dense covering of hairs while sun plants are less hairy
4. The stems of shade plants are taIler and more branched than that of sun plants
Consider the following statements: 1. There is no change in temperature when a liquid is being evaporated into vapour 2. Vapour is a mixed phase of liquid and gas in the zone between saturated liquid line and saturated vapour line 3. The saturated dry vapour curve is steeper as compared to saturated liquid curve on a T-s diagram 4. The enthalpy of vaporization decreases with increase in pressure Which of the above statements are correct?
An air-water vapour mixture has a dry bulb temperature of 60°C and a dew point temperature of 40°C. The total pressure is 101.3 kPa and the vapour pressure of water at 40°C and 60°C are 7.30 kPa and 19.91 kPa respectively.The humidity of air sample expressed as kg of water vapour/kg of dry air is
At 100°C, water and methylcyclohexane both have vapour pressures of 1 atm. Also at 100°C, the latent heats of vaporisation of these compounds are 40.63 kJ/mole for water and 31.55 kJ/mole for methylcyclohexane. The vapour pressure of water at 150°C is 4.69 atm. At 150°C, the vapour pressure of methylcyclohexane would be expected to be
A vessel of volume 1000 m3 contains air which is saturated with water vapour. The total pressure and temperature are 100 kPa and 20°C respectively. Assuming that the vapour pressure of water at 20°C is 2.34 kPa, the amount of water vapour (in kg) in the vessel is approximately
S1:Palaeobotany is the study of fossil plants preserved in rocks dating back in millions of years.
P :Records of the history of the world are contained in fossils.
Q :Through the ages, plants have evolved from simple to more complex forms.
R :First there were water plants then land plants appeared during the Paleozoic era.
S :But since the fossil remains appear locked in rock layers, they are closely related to the geologist area of investigation.
S6:The fossil plants indicate the age of the rock, and also point to facts regarding climate, temperature and topography.

The Proper sequence should be:
Consider the following statements in respect of a vapour-absorption refrigeration cycle: 1. The absorption refrigeration cycle is generally used when waste heat is a available from an existing source or when free energy like solar energy is to be used. 2. There are no moving parts in the absorption refrigeration plant except a small liquid pump. 3 the value of the coefficient of performance is nearly the same in both vapour-absorption and vapour-compression refrigeration plants. Which of the above statements are correct?
Plants have been used as healers and health rejuvenators since times immemorial. More than half the drugs under clinical use owe their origin to plants. The Glossary of Indian Medicinal Plants lists 3000 plants. Which part of the plants is used most for medicinal properties ? 
Consider the following statements and choose the correct answer:
1. The C4 plants can absorb CO2 even from a much low CO2 concentration when the C3 plants fail to avail it
2. The C4 plants require less energy to fix CO2 as compared to C3 plants
3. C4 plants are better adapted to tropical and desert areas where sunlight is more intense and the growing season is longer
4. Maize is a C4 plant